Home / 138,886.19-191,662.04-78,476.39

Finding the Fourth Proportional to 138,886.19, 191,662.04 and 78,476.39

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Solution

The fourth proportional to 138,886.19, 191,662.04 and 78,476.39 is: 108,296.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,886.19 : 191,662.04 = 78,476.39 : x
  2. Step 2: Convert to fraction form
    138,886.19/191,662.04 = 78,476.39/x
  3. Step 3: Cross multiply
    138,886.19x = 191,662.04 × 78,476.39
  4. Step 4: Simplify right side
    138,886.19x = 15,040,943,648.54
  5. Step 5: Solve for x
    x = 15,040,943,648.54/138,886.19
  6. Step 6: Final answer
    x = 108,296.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.